Create CONTRIBUTING.md

CONTRIBUTING.md

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+Steps for creating a Pull Request
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+See README.md to learn how to create a one-click app json file
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+Make sure it's fully tested using the methods mentioned in readme
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+Put as much default values as possible (except passwords) to ensure minimum effort required
+
+Avoid using "latest" docker tag at it's a rolling tag and things might change with latest tag. We want to ensure a predictable output. Users can edit the tag if they want, but the default should be pointing to a fixed version.
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